Earl Donnchad of Osraige

Earl Donnchad Mac Gilla-Patraic of Osraige (1050-), also known as Duncan Kilpatrick of Ossory, was the Earl of Ossory under King Einri of Eire during the late 11th century. In 1090, he agreed to become a vassal of King Einri, allowing for Einri to create a new kingdom: Ireland.